Case studies are presented for two concrete lined channels shaken by strong ground motions during the 1994 Northridge earthquake, the high speed channel （HSC） and bypass channel （BC）, on the Los Angeles Department...Case studies are presented for two concrete lined channels shaken by strong ground motions during the 1994 Northridge earthquake, the high speed channel （HSC） and bypass channel （BC）, on the Los Angeles Department of Water and Power＇s Van Norman Complex. Performances of these two channels as they pass through different subsurface materials identify several important seismic aspects and the critical role of geotechnical earthquake engineering in assessing channel behaviors. Preliminary evaluations using detailed mapping of channel cracks, permanent ground movements, subsurface profiles, and nearby strong ground motion recordings from the 1994 earthquake show that the channel liners may have been damaged from both transient motions and permanent ground movements. Damage from permanent ground deformations is obvious by observation; therefore simplified analyses are presented only for transient movements. Site specific transient response analyses are performed to provide an initial assessment of the differing effects from transient and permanent ground movements on HSC and BC liner damage. These case studies are helpful for introducing the potential for lifeline damage from transient movements within zones of permanent ground movement, a concept not well understood in the earthquake engineering community展开更多
Research projects in earthquake engineering yield a very large amount of complex data from experiments and computer simulations.Understanding and exchanging these complicated and voluminous data sets prompted the deve...Research projects in earthquake engineering yield a very large amount of complex data from experiments and computer simulations.Understanding and exchanging these complicated and voluminous data sets prompted the development of metadata models that document the processes of data generation,and facilitate the collaboration and exchange of information between researchers.The present metadata model was designed to document and exchange a large number of large data files in earthquake engineering,but is applicable to other fields of engineering and science.The model was conceived based on a series of former data models,which were unduly complicated and limited to few types of experiments.Simpler than its predecessors,the present metadata model applies to all kinds of earthquake engineering experiments.It was developed in the object-oriented with examples from centrifuge experiments.展开更多
文摘Case studies are presented for two concrete lined channels shaken by strong ground motions during the 1994 Northridge earthquake, the high speed channel （HSC） and bypass channel （BC）, on the Los Angeles Department of Water and Power＇s Van Norman Complex. Performances of these two channels as they pass through different subsurface materials identify several important seismic aspects and the critical role of geotechnical earthquake engineering in assessing channel behaviors. Preliminary evaluations using detailed mapping of channel cracks, permanent ground movements, subsurface profiles, and nearby strong ground motion recordings from the 1994 earthquake show that the channel liners may have been damaged from both transient motions and permanent ground movements. Damage from permanent ground deformations is obvious by observation; therefore simplified analyses are presented only for transient movements. Site specific transient response analyses are performed to provide an initial assessment of the differing effects from transient and permanent ground movements on HSC and BC liner damage. These case studies are helpful for introducing the potential for lifeline damage from transient movements within zones of permanent ground movement, a concept not well understood in the earthquake engineering community
基金the George E.Brown Jr for Network Earthquake Engineering Simulation(NEES)Information Technology Research(ITR)programs of the National Science Foundation.
文摘Research projects in earthquake engineering yield a very large amount of complex data from experiments and computer simulations.Understanding and exchanging these complicated and voluminous data sets prompted the development of metadata models that document the processes of data generation,and facilitate the collaboration and exchange of information between researchers.The present metadata model was designed to document and exchange a large number of large data files in earthquake engineering,but is applicable to other fields of engineering and science.The model was conceived based on a series of former data models,which were unduly complicated and limited to few types of experiments.Simpler than its predecessors,the present metadata model applies to all kinds of earthquake engineering experiments.It was developed in the object-oriented with examples from centrifuge experiments.
